<template>
    <section class="real-app">
       <input
            type="text"
            class="add-input"
            autofocus="autofocus"
            placeholder="接下去要做什么？"
            @keyup.enter="addTodo"
        >
        <Item
           :todo="todo"
            v-for="todo in filteredTodos"
            :key="todo.id"
            @del="deleteTodo"
        />
        <tabs
            :filter="filter"
            :todos="todos"
            @toggle="toggleFilter"
            @clearAllCompleted="clearAllCompleted"
        />
        <!-- <router-view /> -->
    </section>
</template>
<script>
import Item from './item.vue'
import Tabs from './tabs.vue'
let id = 0
export default {
  beforeRouteEnter (to, from, next) {
    console.log('todo before enter')
    next(vm => {
      console.log('this.id' + vm.id)
    })
  },
  beforeRouteUpdate (to, from, next) {
    console.log('todo Update enter')
    next()
  },
  beforeRouteLeave (to, from, next) {
    console.log('todo Leave enter')
    next()
  },
  data () {
    return {
      todos: [],
      filter: 'all'
    }
  },
  props: ['id'],
  // 组件
  components: {
    Item,
    Tabs
  },
  // 计算
  computed: {
    filteredTodos () {
      if (this.filter === 'all') {
        return this.todos
      }
      const completed = this.filter === 'completed'
      return this.todos.filter(todo => completed === todo.completed)
    }
  },
  // 方法
  methods: {
    addTodo (e) {
      this.todos.unshift({
        id: id++,
        content: e.target.value.trim(),
        completed: false
      })
      e.target.value = ''
    },
    deleteTodo (id) {
      this.todos.splice(this.todos.findIndex(todo => todo.id === id), 1)
    },
    toggleFilter (state) {
      this.filter = state
    },
    clearAllCompleted () {
      this.todos = this.todos.filter(todo => todo.completed === false)
    }
  }
}
</script>

<style lang="stylus" scoped>
    .real-app {
        width 600px
        margin 0 auto
        box-shadow 0 0 5px #666
    }

    .add-input {
        position: relative;
        margin: 0;
        width: 100%;
        font-size: 24px;
        font-family: inherit;
        font-weight: inherit;
        line-height: 1.4em;
        border: 0;
        outline: none;
        color: inherit;
        box-sizing: border-box;
        font-smoothing: antialiased;
        padding: 16px 16px 16px 36px;
        border: none;
        box-shadow: inset 0 -2px 1px rgba(0, 0, 0, 0.03);
    }
</style>